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IP Services and QoS Flashcards

6 cards from real Cisco ENCOR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which field in the IPv4 header is used by DiffServ to carry DSCP markings?

    Answer: ToS (Type of Service) / DSCP field

    The 6-bit DSCP value is carried in the Type of Service (ToS) byte of the IPv4 header (specifically the top 6 bits).

  2. What is the primary purpose of HSRP (Hot Standby Router Protocol)?

    Answer: Provide a virtual default gateway with automatic failover for LAN hosts

    HSRP provides a virtual IP and MAC address shared between routers, allowing transparent failover if the active router fails.

  3. In NAT, what does PAT (Port Address Translation) allow?

    Answer: Many internal hosts to share a single public IP by using unique source port numbers

    PAT (also called NAT overload) allows many internal hosts to share one public IP by differentiating connections with unique source port numbers.

  4. What is the SNMP OID structure based on?

    Answer: A hierarchical tree defined by the Management Information Base (MIB)

    SNMP Object Identifiers (OIDs) are structured as a hierarchical dotted-decimal tree defined by the MIB standard.

  5. Which first-hop redundancy protocol is an open standard (not Cisco proprietary)?

    Answer: VRRP

    VRRP (Virtual Router Redundancy Protocol, RFC 5798) is the open-standard equivalent of Cisco's proprietary HSRP.

  6. What does the 'ip helper-address' command do on a Cisco router interface?

    Answer: Forwards broadcast UDP packets (including DHCP) to a specified unicast address

    The ip helper-address command forwards specific broadcast UDP packets, primarily DHCP Discover, to a unicast DHCP server address.

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  1. cisco.com — Eligibility, renewal, score validity, test delivery, fees, time limit · verified Oct 2026
IP Services and QoS Flashcards — Cisco ENCOR Study Cards with Answers